Forum Discussion
Brad_Parker
Feb 11, 2015Cirrus
The FQDN node list will auto populate all the nodes that are returned by the DNS query; they are called ephemeral nodes. You need to make sure your DNS server is set to return all A records for this to occur.
- JGFeb 11, 2015CumulonimbusThanks for your response. Does this mean that the total or maximum number of pool members/nodes is determined from the initial DNS query of the fqdn made at the time of pool creation, i.e. the number of A records returned? And just how ephemeral are these pool members/nodes? Are all subsequent DNS queries based on the TTL of the records? There should be a sol article to give us more details about this.
- Brad_ParkerFeb 11, 2015CirrusI've actually been playing with this in our test environment. The nodes will be created at the time of the original DNS query, however you can configure the LTM to auto populate and you can choose the interval that the LTM re-queries DNS. By default auto populate is on and re-checks once an hour. If an IP is not returned that was originally it will be removed and subsequently, if a new IP is returned it will be added. I hope this helps. https://support.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/ltm-implementations-11-6-0/32.print.html